Value Collection 409066PR Set Screw 5/16-18 2-1/2in Cup Point

Product Description

The VALUE COLLECTION 409066PR is a cup point set screw designed for mechanical assemblies requiring a secure, non-projecting fastener. It features a 5/16-18 UNC thread with a 2.5-inch length measured under the head, and is manufactured from Grade 2 alloy steel. The square drive type allows for reliable torque application with a standard square key or bit. Cup point geometry bites into the mating surface to resist axial and rotational movement. This fastener is installed by machinists, millwrights, and maintenance technicians across industrial and commercial settings.

This set screw is suited for use in shaft-to-hub connections, collars, pulleys, gears, and similar mechanical assemblies where a flush or recessed fastener is required. The cup point style is a common choice when a moderate bite into a soft or hardened shaft is acceptable and permanent deformation of the mating part is not a concern. The 5/16-18 UNC thread makes it compatible with standard tapped holes in that size across a wide range of equipment.

Key Features

• Cup point geometry provides positive grip on mating shaft surfaces
• 5/16-18 UNC thread for compatibility with standard fractional tapped holes
• 2.5-inch length under head suits deeper engagement applications
• Grade 2 alloy steel construction for strength in general mechanical service
• Square drive allows high torque input without cam-out
• Headless design sits flush or below surface for clearance-critical assemblies

Compatibility

Designed as a standard replacement or service fastener for any mechanical assembly using a 5/16-18 UNC threaded set screw with cup point and square drive.

Installation Notes

Installation requires a properly sized square key or bit driver. Always verify the tapped hole thread condition before installation and ensure the mating shaft or component is free of burrs that could affect seating. De-energize or lock out any equipment before servicing fasteners on rotating assemblies. Torque to the assembly manufacturer's specification for the thread size and material grade.